The Experts below are selected from a list of 90 Experts worldwide ranked by ideXlab platform

M. Cohen - One of the best experts on this subject based on the ideXlab platform.

  • CIT - Multipresence Narrowcasting Operations Comprise a Media Meta-Mixer Exponentiating Interface Value
    The Fifth International Conference on Computer and Information Technology (CIT'05), 2005
    Co-Authors: M. Cohen
    Abstract:

    Multipresence allows each human user, in, for example, a distributed groupware system like the Internet, to have source and sink presence in multiple spaces at once, by designating an arbitrary number of representatives as "self" operations which filter information streams by blocking sources or sinks are useful for distributing and focusing attention and presence. Such "narrowcasting" operations can be modeled as an extended "media mixer": source operations apply to first-order mixing; sink operations apply to second-order mixing. The Value of such an multipresent Interface, articulated with narrowcasting operations, can be characterized as exponential in the number of users, the power set of the number of coteries. Audio windows are, in analogy to graphical windowing systems, an idiom for managing multiple duplex streams of information, as in a teleconference, chatspace, or virtual concert. We are developing audio windowing Interfaces to groupware and VR-style applications, deployed on both workstations and mobile devices, and present a multipresence-enabled audio windows media mixer

  • Multipresence Narrowcasting Operations Comprise a Media Meta-Mixer Exponentiating Interface Value
    The Fifth International Conference on Computer and Information Technology (CIT'05), 2005
    Co-Authors: M. Cohen
    Abstract:

    Multipresence allows each human user, in, for example, a distributed groupware system like the Internet, to have source and sink presence in multiple spaces at once, by designating an arbitrary number of representatives as "self" operations which filter information streams by blocking sources or sinks are useful for distributing and focusing attention and presence. Such "narrowcasting" operations can be modeled as an extended "media mixer": source operations apply to first-order mixing; sink operations apply to second-order mixing. The Value of such an multipresent Interface, articulated with narrowcasting operations, can be characterized as exponential in the number of users, the power set of the number of coteries. Audio windows are, in analogy to graphical windowing systems, an idiom for managing multiple duplex streams of information, as in a teleconference, chatspace, or virtual concert. We are developing audio windowing Interfaces to groupware and VR-style applications, deployed on both workstations and mobile devices, and present a multipresence-enabled audio windows media mixer

Senjo Shimizu - One of the best experts on this subject based on the ideXlab platform.

Tjitske Holtrop - One of the best experts on this subject based on the ideXlab platform.

  • 6.15%: Taking Numbers at Interface Value
    Science and technology studies, 2017
    Co-Authors: Tjitske Holtrop
    Abstract:

    This article discusses a number, 6.15%, as it comes into being in the course of an evaluation study of education in a southern Afghan province. This number indicates that out of 100 school-aged girls 6.15 go to school. While this kind of number may invite refl ections on its epistemic accuracy, more often it draws attention to its inherent negative — the girls that do not go to school — substantiating a need for sustained international commitment. As this article will show, numbers work to establish girls as research entities, as part of populations, and as a concern for the Afghan government and the international intervention. This interfacing work of numbers — between girls, states, interventions, and research protocols — is often absent from academic work that takes numbers to be stable and passive tools with which the world can be known. This article, instead, takes numbers to have an internally complex multiplicity and to actively engage with their environments. In this article, I use the Interface between numbers and environment as a space for ethnographic exploration of world-making. By describing three moments in the lifecycle of the number — data cleaning, analysis and presentation — I describe three distinct moments of interfacing in which the number comes to act in three capacities: effecting reference, constituting proportional comparison, and evoking doubt and certainty. Detailed understanding of numbering practices provides an opportunity to not just critically assess numbers as end products but to carefully assess the worlds that emerge alongside numbering practices and the ways in which numbers contribute in processes of governance.

  • 6 15 taking numbers at Interface Value
    Science and technology studies, 2017
    Co-Authors: Tjitske Holtrop
    Abstract:

    This article discusses a number, 6.15%, as it comes into being in the course of an evaluation study of education in a southern Afghan province. This number indicates that out of 100 school-aged girls 6.15 go to school. While this kind of number may invite refl ections on its epistemic accuracy, more often it draws attention to its inherent negative — the girls that do not go to school — substantiating a need for sustained international commitment. As this article will show, numbers work to establish girls as research entities, as part of populations, and as a concern for the Afghan government and the international intervention. This interfacing work of numbers — between girls, states, interventions, and research protocols — is often absent from academic work that takes numbers to be stable and passive tools with which the world can be known. This article, instead, takes numbers to have an internally complex multiplicity and to actively engage with their environments. In this article, I use the Interface between numbers and environment as a space for ethnographic exploration of world-making. By describing three moments in the lifecycle of the number — data cleaning, analysis and presentation — I describe three distinct moments of interfacing in which the number comes to act in three capacities: effecting reference, constituting proportional comparison, and evoking doubt and certainty. Detailed understanding of numbering practices provides an opportunity to not just critically assess numbers as end products but to carefully assess the worlds that emerge alongside numbering practices and the ways in which numbers contribute in processes of governance.

Thierry Gallouët - One of the best experts on this subject based on the ideXlab platform.

  • On an Approximate Godunov Scheme
    International Journal of Computational Fluid Dynamics, 1999
    Co-Authors: Jean-marie Masella, Isabelle Faille, Thierry Gallouët
    Abstract:

    We are interested in the numerical resolution of hyperbolic systems of conservation laws which do not allow any analytical calculation and for which it is difficult to use classical schemes such as Roe's scheme. We introduce a new finite volume scheme called VFRoe. As the Roe scheme, it is based on the local resolution of a linearized Riemann problem. The numerical flux is defined following the Godunov scheme, as the physical flux evaluated at the Interface Value of the linearized solver. The VFRoe scheme is conservative and consistent without fulfilling any Roe's type condition. Some numerical tests on shock tube problems and two-phase flows problems are presented.

Abdullah Shah - One of the best experts on this subject based on the ideXlab platform.

  • Two-phase flow simulations using Diffuse Interface model
    2017 14th International Bhurban Conference on Applied Sciences and Technology (IBCAST), 2017
    Co-Authors: Sadia Saeed, Abdullah Shah
    Abstract:

    In this work, a numerical scheme based on artificial compressibility formulation of a diffuse-Interface model is developed for simulating two-dimensional two-phase incompressible flows. The coupled nonlinear systems composing of the incompressible Navier-Stoke equations(NSeqs) and volume preserving Allen-Cahn type phase equation are recast into conservative forms with source terms, which are suited to implementing high-order schemes. The Boussinesq approximation is used for buoyancy effects in flows with small density densities. The fifth-order weighted essentially non-oscillatory scheme is used for discretizing the convective terms while for obtaining time accuracy at each physical time step dual-time stepping (DTS) approach is used. Beam-Warming approximate factorization scheme is utilized so as to obtain block tridiagonal system of equations in each spatial direction which can be solved efficiently with the alternating direction implicit (ADI) algorithm. The performance of the numerical method is demonstrated by its application to benchmark viscous two-phase flow problems. Numerical experiments shows that the method allows larger time-steps and smaller Interface Value η than previous projection methods in literature when computing problems with moving Interfaces and topological changes.